Frothing, turbulent lava flowing through a tube, or breakdown
falling into molten lava, can splash stalactites on the ceiling, coating
them with additional lava. The ends of such stalactites are likely to
be irregular, as dripping lava hardens. In the first photo, a later
flow of red lava has splashed the pre-existing stalactites.

More commonly, splash stalactites can be a primary
form, creating stalactites where none had existed before, as in the
lower photo.